... are worried that people might fall off the back of this bus and get run over by the vehicle behind.
(You have to stay the above in a stereotype joke whiny voice to get the proper effect)
Except that it's not a joke. The only concession to that risk that they might have made (and it's not clear) is that they might have changed the orientation of the staircase so that falling down it does dump you directly onto the rear platform, with the possibility of double your (un)luck and fall onwards onto the road. Apart from that, it may look pretty, but it's still only got one entrance (and hence one pinch point) into the lower deck saloon, so it's not going to improve access when the entire thing is rammed during the rush hour. A multiple entrance double decker might have made more sense, but this?